臺灣博碩士論文加值系統

本研究將石墨酸化成氧化石墨後，再加以改質使其與合成的共軛高分子PDOFT均勻摻混並還原，形成高分子複合材料PDOFT/GS。氧化石墨的鑑定以FTIR及WAXD分析表面結構，並藉由原子力顯微鏡AFM、電子顯微鏡SEM及TEM來觀察氧化石墨的表面形貌，在HR-TEM下觀察到高分子複材PDOFT/GS中具有石墨烯晶格。另外，合成的高分子複合材料皆有良好的熱穩定性，裂解溫度均在400℃以上，由DSC分析顯示出複材沒有Tm。利用UV/Vis吸收光譜與PL放射光譜來分析高分子複材PDOFT/GS的光學性質，再探討其電性上及元件上的特性，當高分子PDOFT中有掺混石墨烯時，其載子遷移率有上升的趨勢，能有效降低元件的驅動電壓，並且使得發光效率比沒有掺混石墨烯時提高兩倍以上。

Graphite was acidified to convert to graphite oxide via the Hummers method, and the resulting exfoliated graphite oxide sheets were reduced by phenylhydrazine in the presence of conjugated polymer PDOFT to form the PDOFT/GS polymeric nanocomposite. This novel polymeric nanocomposite was characterized by FT-IR spectroscopy, X-ray photoelectron spectroscopy, atomic force microscope, scanning electron microscopy, transmission electron microscope, UV/Vis spectroscopy, photoluminescence spectroscopy and various optoelectronic instruments. TGA and DSC analyses indicate that all polymeric nanocomposites are thermally stable up to 400℃ without detectable melting points. By introducing graphene sheets into the polymer matrix, the threshold voltage of the PLED device is lowered and both of the current efficiency and the carrier mobility were improved.

中文摘要 I
Abstract II
目錄 III
圖目錄 VIII
表目錄 XII
第一章 緖論 1
1.1 前言 1
1.2 碳材鍵結 2
1.2-1 石墨 3
1.2-2 鑽石 4
1.2-3 C60 4
1.3 有機發光二極體發光原理 5
1.3-1 螢光的成因 5
1.3-2電激發光原理 8
1.3-3 能帶結構 10
1.3-4 高分子發光二極體內部電荷 11
1.4 高分子發光二極體元件結構 12
第二章 文獻回顧 16
2.1 碳系 16
2.1-1石墨烯(graphene sheets) 17
2.2 應用於發光二極體之高分子 20
2.2-1 不同光色高分子的化學結構與其光物理 22
2.2-2 PPV系高分子 23
2.2-3 PPP系高分子 24
2.2-4 PF系高分子 25
2.2-5 PT系高分子 27
2.3 研究動機與目的 28
第三章 實驗內容與儀器分析 29
3.1 實驗藥品 29
3.2 實驗設備與分析儀器 31
3.3 儀器分析 34
3.3-1 凝膠滲透層析儀 (Gel Permeation Chromatography, GPC) 34
3.3-2 核磁共振儀(Nuclear Magnetic Resonance Spectrometer, NMR) 36
3.3-3 傳立葉轉換—紅外線光譜分析 (FT-IR ) 36
3.3-4 調幅式微差掃描熱分析儀 (Modulated Differential Scanning Calorimetry,MDSC) 38
3.3-5 熱重分析儀(Thermogravimetric Analyzer,TGA) 43
3.3-6 原子力顯微鏡(Atomic Force Microscope, AFM) 44
3.3-7 掃描式電子顯微鏡(Scanning Electron Microscope, SEM) 45
3.3-8 穿透式電子顯微鏡(Transmission Electron Microscope, TEM) 45
3.3-9 紫外光-可見外吸收光譜儀(UV/Vis spectroscopy, UV/Vis) 46
3.3-10 光激發光螢光光譜儀(Photoluminescence, PL)與電激發光光譜儀(Electroluminescence, EL) 48
3.3-11 螢光相對量子效率(Quantum Efficiency) 49
3.3-12 循環伏特安培儀(Cyclic Voltammeter , CV) 50
3.3-13 電特性分析儀(Current-Voltage Curve) 51
3.3-14 四點探針(Four-Probe) 52
3.3 合成反應原理 53
3.3-1 Suzuki cross-coupling reaction 53
3.3-2 高分子合成反應步驟與結果 55
3.3-3 石墨氧化剝落形成薄片(GO) 57
3.3-4 氧化石墨氯化(GO-COCl) 58
3.3-5 以化學還原法製備PDOFT/graphene sheets奈米複合材料 59
第四章?結果與討論 60
4.1 前言 60
4.2 石墨酸化及改質之結構分析 61
4.2-1 FTIR分析研究 61
4.2-2 WAXD分析研究 64
4.3 石墨改質及複材PDOFT/GS物性分析 65
4.3-1 高分子分子量及複材溶解度測試 65
4.3-2 原子力顯微鏡(AFM)分析研究 67
4.3-3 掃描式電子顯微鏡(SEM)分析研究 70
4.3-4 穿透式電子顯微鏡(TEM)分析研究 74
4.4 石墨改質及複材PDOFT/GS熱性質分析 78
4.4-1 熱重分析(TGA) 78
4.4-2 調幅式微差掃瞄(MDSC)熱分析 81
4.5 複材PDOFT/GS之光學性質分析研究 83
4.5-1 UV/Vis吸收光譜研究分析 83
4.5-2 PL放射光譜分析 84
4.6 複材PDOFT/GS之電化學性質分析研究 88
4.6-1四點探針(Four-Probe) 88
4.6-1循環伏安法(Cyclic Voltammetry，CV) 90
4.7 元件製作及性能測試 94
4.7-1元件製作 94
4.7-2 EL放射光譜 95
4.7-3 電流密度(I)-電壓(V)-亮度(L)圖分析研究 96
4.7-4導納頻譜(Admittance Spectroscopy) 99
第五章 結論 103
參考文獻 105

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